EP2717236A1 - Agencement de détecteur optique pour accepteur de documents - Google Patents

Agencement de détecteur optique pour accepteur de documents Download PDF

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Publication number
EP2717236A1
EP2717236A1 EP13198955.0A EP13198955A EP2717236A1 EP 2717236 A1 EP2717236 A1 EP 2717236A1 EP 13198955 A EP13198955 A EP 13198955A EP 2717236 A1 EP2717236 A1 EP 2717236A1
Authority
EP
European Patent Office
Prior art keywords
light
document
fresnel
document path
array
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13198955.0A
Other languages
German (de)
English (en)
Other versions
EP2717236B1 (fr
Inventor
Edward M. Zoladz
John D. Snider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crane Payment Innovations Inc
Original Assignee
MEI Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MEI Inc filed Critical MEI Inc
Publication of EP2717236A1 publication Critical patent/EP2717236A1/fr
Application granted granted Critical
Publication of EP2717236B1 publication Critical patent/EP2717236B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/121—Apparatus characterised by sensor details
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide

Definitions

  • This disclosure relates to an optical detector arrangement and, more particularly to an optical detector arrangement for a document acceptor, such as a currency validator.
  • Document acceptors such as those used in the vending and gaming industries, typically contain sensing means to detect the physical presence of a document (e.g., a bill) being processed, or to detect the transitional state of movable elements in the machine.
  • An effective and widely-used type of sensing means is an optical sensing means, which may include a light source and a light receiver. Such sensors typically have no moving parts and do not require physical contact with the object being sensed in order to function properly.
  • Such sensors sometimes generate signals corresponding to the light transmitted through a document as it moves past. Those signals are processed to determine certain information, such as the position of the document in the passageway and the authenticity of the document. To make such determinations, the signals are compared to data stored in memory that corresponds to genuine bills.
  • a document validator or a sensor arrangement for a document acceptor using optical transmissive measurements includes at least one light source located on a first side of a document path and arranged to transmit light around the document path to a second side of the document path. The second side is opposite the first side.
  • Optical detectors are located on the first side of the document path and are arranged to receive light sent from the light source and that passes through the document path.
  • the sensor arrangement includes one or more printed circuit boards on the first side of the document path and the light source(s) and optical detectors are mounted to the printed circuit board(s). Indeed, the light source(s) and the optical detectors may be mounted to the same printed circuit board.
  • the light source(s) are arranged such that, with a document in the document path, light transmitted by the light source to the second side of the document path reaches the second side of the document path substantially without passing through the document.
  • a light pipe assembly may be located on the second side of the document path and arranged to receive light from the light source(s) and transmit light through a document in the document path, if such a document is present in the document path.
  • a document validator or a sensing arrangement for a document acceptor includes a light source, optical detectors and an array of fresnel lenses.
  • the array of fresnel lenses includes a first fresnel structure on a first side of the array and a second, orthogonal fresnel structure on a second side of the array.
  • the first fresnel structure extends continuously across substantially an entire length of the array.
  • the second fresnel structure has fresnel segments. Each fresnel segment corresponds to one of the plurality of optical detectors. Light from the light source passes through the array of fresnel lenses to the optical detectors.
  • the array of fresnel lenses is arranged to anamorphically distort light that passes through the array. In some implementations, the array of fresnel lenses is arranged to anamorphically compress light that passes through the array.
  • each of the first and second fresnel structures respectively includes a convex central region, a first set of teeth that extends across the array on a first side of the convex central region and a second set of teeth that extends across the array on a second side of the convex central region.
  • the first side of the fresnel lens array substantially faces the optical detectors.
  • a light pipe assembly in yet another aspect, includes a first light input port at a first end of the light pipe assembly, a light emitting surface that extends substantially from the first end to a second end of the light pipe assembly and surface features in the light emitting surface.
  • Each surface feature defines a first internally reflective boundary at a far end of the surface feature relative to the first light input port.
  • Light that enters the first input port is directed to the first internally reflective boundaries.
  • One or more reflective surfaces are arranged to reflect light from the first internally reflective boundaries through the light emitting surface.
  • the first internally reflective boundaries vary in size across the light emitting surface. In some implementations, the first internally reflective boundaries increase in size from the first end of the light pipe assembly to the second end of the light pipe assembly.
  • the light pipe assembly also includes a second light input port at the second end of the light pipe assembly.
  • each surface feature in the light emitting surface defines a second internally reflective boundary at a far end of the surface feature relative to the second light input port.
  • Light that enters the second light input port is directed to the second internally reflective boundaries.
  • the one or more reflective surfaces reflect light from the second internally reflective boundaries through the light emitting surface.
  • the second internally reflective boundaries vary in size across the light emitting surface. In some implementations, the second internally reflective boundaries increase in size from the second end of the light pipe assembly to the first end of the light pipe assembly.
  • the surface features have substantially trapezoidal bases with, for example, a pair of substantially parallel sides, one of which is longer than the other.
  • the first and second internally reflective boundaries may be arranged to substantially totally internally reflect the light from the first and second light input ports, respectively.
  • the first and second input ports and the light emitting surface are arranged such that light enters the first or second input ports from a first direction and exits the light emitting surface in a second direction, opposite the first.
  • the reflective surfaces may be adapted to diffusely reflect light.
  • the surface features are substantially pyramid-shaped.
  • Some implementations include multiple first light input ports at the first end of the light pipe assembly and/or multiple second light input ports at the second end of the light pipe assembly.
  • a document validator in still another aspect, includes one or more light sources, a light pipe assembly, a lens arranged to at least partially collimate light that is emitted from a light emitting surface of the light pipe assembly and optical detectors arranged to receive the at least partially collimated light.
  • the light pipe assembly includes a first light input port at a first end thereof. The first light input port is arranged to receive light from one of the light sources.
  • a light emitting surface extends substantially from the first end to a second end of the light pipe assembly. Surface features are formed in the light emitting surface. Each surface feature defines a first internally reflective boundary at a far end of the surface feature relative to the first light input port. Light that enters the first input port is directed to the first internally reflective boundaries and to one or more reflective surfaces arranged to reflect light from the first internally reflective boundaries through the light emitting surface. The first internally reflective boundaries vary in size across the light emitting surface.
  • the document validator also has a second light input port at the second end of the light pipe assembly.
  • the second light input port is arranged to receive light from a second one of the light sources.
  • Each surface feature in the light emitting surface defines a second internally reflective boundary at a far end of the surface feature relative to the second light input port.
  • Light that enters the second light input port is directed to the second internally reflective boundaries and the one or more reflective surfaces reflect light from the second internally reflective boundaries through the light emitting surface.
  • the second internally reflective boundaries vary in size across the light emitting surface.
  • Some implementations include multiple first light input ports at the first side of the light pipe assembly and/or multiple first light input ports at the second side of the light pipe assembly.
  • Light sources and optical detectors can reside on the same side of a bill path in a document acceptor that utilizes optical transmission detection. Such an arrangement can simplify construction and minimize hardware required in the document acceptor. Additionally, placing the light sources and optical detectors on the same side of the bill path can simplify the maintenance, testing and repair of document acceptors. This is particularly true if the light sources and optical detectors are on the same circuit board.
  • the profile of light intensity/brightness across a light emitting surface may be controlled and customized, for example, to accommodate for losses in light intensity/brightness that might otherwise occur across a light pipe assembly.
  • the number of optical detectors required to detect a document in a document path may be reduced.
  • Fresnel lenses are relatively easy to fabricate, particularly as compared to functionally comparable conventional lenses. Accordingly, fresnel lenses are also relatively inexpensive.
  • FIG. 1 is a cutaway view of an example of a document acceptor 100 (e.g., a bill validator) with certain components removed.
  • a document acceptor 100 e.g., a bill validator
  • the term "document” as used herein includes any paper currency, banknote, bar-coded coupon or other security note which may be used in exchange for goods or services.
  • the illustrated document acceptor 100 includes a validation portion 102, a transport and stacking portion 104 and a magazine portion 106.
  • the path of a document 108 through the document acceptor 100 is indicated by dotted line 110.
  • the document path 110 includes the spaces that a document might actually pass through while moving through the document acceptor 100.
  • the illustrated transport system includes a pair of drive rollers 112, a first pair of driven rollers 114 and a second pair of driven rollers 116 provided on one side of the document path 110.
  • the first pair of driven rollers 114 is coupled to the pair of drive rollers 112 by a pair of belts 118.
  • the second pair of driven rollers 116 is coupled to the first pair of driven rollers 114 by a pair of belts 120.
  • the rollers 112, 114 and 116 include teeth to engage corresponding teeth on the belts 118, 120.
  • Rollers 122 preferably bear against belts 118 to maintain tension on the belts 118 during operation. Only one of each pair of rollers and belts is shown in FIG. 1 .
  • pairs of spring loaded rollers 124, 126 and 128 press against the first pair of driven rollers 114 and the second pair of driven rollers 116.
  • a motor (not shown) is coupled to the pair of drive rollers 112 through coupling gears (not shown).
  • a control and processing circuit which includes a microprocessor (not shown) controls operations of the acceptor unit.
  • a document sensor assembly 136 is shown schematically intersecting the document path 110.
  • the document sensor assembly 136 typically includes one or more light sources (e.g., light emitting diodes) and optical detectors, all of which may be mounted to the printed circuit board 139.
  • the optical detector assembly 136 also typically includes a light pipe assembly on an opposite side of the document path 110 from the light sources and optical detectors.
  • the light pipe assembly may be adapted to receive light from the light sources and direct that light across the bill path 110 to the optical detectors.
  • the printed circuit board 139 includes other circuitry related to optical detector assembly operations.
  • the optical detectors 202 and light sources 204 are located on a first side of the document path 110. In some implementations, the optical detectors 202 and light sources 204 are mounted on the same circuit board (e.g., circuit board 139 in FIG. 1 ). The optical detectors 202 and light sources 204 may be coupled to other circuitry (not shown) for control and signal processing.
  • the upper document path window 210 is below the fresnel lens array 208.
  • the lower document path window 212 is below the upper document path window 210.
  • the upper and lower document path windows 210, 212 extend in a substantially perpendicular direction relative to the document's 108 travel direction 219. Substantially flat surfaces on the upper and lower document path windows 210, 212 define a portion of the document path 110 therebetween. Portions of the upper and lower document path windows 210, 212 are translucent and, therefore, allow light to enter the document path 110 through the lower document path window 212 and to exit the document path 110 through the upper document path window 210.
  • the upper document path window 210 has approximately the same width as the fresnel lens array 208.
  • the second internally reflective boundaries 654a, 654b, 654c vary in size across the light emitting surface 402. In the illustrated portion of the light pipe assembly 216, the second internally reflective boundaries 654a, 654b, 654c increase in size from surface feature 404a to surface feature 404c.
  • the light emitting surface 402 of the light pipe assembly 216 has a row of pyramid-shaped surface features 404 thereon.
  • the lower document path window 212 is directly above the light emitting surface 402.
  • a fresnel structure (not visible) is on a side of the lower document path window 212 facing the light pipe assembly 216.
  • the upper surface of the lower document path window 212 is substantially flat and forms part of the document path.
  • the length of oblong-shaped area (i.e., in a direction perpendicular to the width) is approximately 7 mm.
  • optical detectors 202 receive light that corresponds to an approximately oblong area of the document path, fewer optical detectors 202 may be required to cover a particular area of the document path.
  • the first fresnel structure 902 includes a convex central region 1150.
  • a first set 1152 of teeth extends across the array on a first side of the convex central region 1150.
  • a second set 1154 of teeth extends across the array on a second side of the convex central region 1150.
  • Each tooth includes a first surface that extends from the array in an approximately normal direction relative to a plane of the array and a second surface that extends from a distal end of the first surface and is angled relative to the plane of the array.
  • the angle of adjacent second surfaces of at least some of the teeth differ from one another. More particularly, the angle of second surfaces in adjacent teeth of each set increases moving away from the convex central region.
  • the number of discrete fresnel segments 910 on the lower fresnel surface 904 is equal to the number of optical detectors 202 in the optical detector assembly, and each fresnel segment 910 is associated with a respective one of the optical detectors 202. Accordingly, in the illustrated implementation, the lower fresnel surface 912 has seven discrete fresnel segments 910, each of which corresponds to an associated one of the optical detectors 202.
  • the fresnel lens array 208 can be made of plastic. However, other materials may be suitable as well.
  • the fresnel lens array 208 may be molded so that it forms part of the document path 110. However, as there are fresnel features on both sides of the fresnel lens array 208, it often will be desirable that the fresnel lens array 208 not form part of the document path 110, as doing so may subject the document path 110 to jamming and collection of dust. It is generally desirable, therefore, to mold the fresnel lens array as a stand-alone piece and to have a separate element (e.g., upper document path window 210) serve as part of the document path.
  • a separate element e.g., upper document path window 2
  • Focal length of the fresnel lens array 208 generally determines optical throughput of each fresnel section. In some implementations, it is desirable that each fresnel section provide anamorphic imaging of an approximately 7 x 12 mm area of the document path 110. In those implementations, a focal length of about 7mm is considered suitable. Shorter focal lengths tend to produce drop-offs in coverage of the imaged area, especially at corners and especially at far working distance. To minimize losses on the edges, it is generally desirable to have shorter focal distance lenses and a short segment widths.
  • FIGS. 12A-D illustrate various views of a single lens 1308 from a fresnel lens array (e.g., fresnel lens array 208).
  • a fresnel lens array e.g., fresnel lens array 208.
  • FIG. 13 is a plan view of a document 108 moving along a document path 1110 past five optical detector coverage areas 1102.
  • the illustrated implementation utilizes five sensors, each adapted to optically cover an approximately 7x12 mm spot at the document path 1110.
  • the 7 mm dimension is taken in the direction of the movement of the document and the 12 mm dimension is taken in the direction of the width of the document path.
  • the light pipe core can include more than one row of surface features.
  • the surface features can be arranged in a non-orderly fashion and can be positioned in only certain places (but not others) along the upper surface of the light pipe core.
  • the surface features can take a variety of shapes, including cubic, cylindrical, pyramid-shaped with a truncated tip, pyramid-shaped with a rounded tip and others. Indeed, the surface feature may be asymmetrical and irregularly shaped.
  • Each surface feature should define an internally reflective boundary, whose size can be modified from surface feature to surface feature across a light emitting surface.
  • the sensor arrangement can include any number of light sources and any number of optical detectors.
  • Various parts of the structures described herein may be integrally formed or formed separately and later secured to one another.
  • the optical detectors and/or the light sources may be formed as an integrated linear array.
  • the various elements may be rearranged in a wide variety of ways.
  • the light pipe assembly could be utilized in reflective or transmissive document acceptors.
  • the light pipe assembly need not be u-shaped. Indeed, a variety of other shapes are possible.
  • the light pipe assembly could be substantially straight, with light input ports at opposite ends thereof.
  • fresnel lens array could be incorporated into a number of different document acceptors, including either reflective or transmissive document acceptors.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Optics & Photonics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Facsimile Scanning Arrangements (AREA)
EP13198955.0A 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de documents Active EP2717236B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82322106P 2006-08-22 2006-08-22
EP07841227.7A EP2066999B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de document

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP07841227.7A Division EP2066999B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de document
EP07841227.7A Division-Into EP2066999B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de document

Publications (2)

Publication Number Publication Date
EP2717236A1 true EP2717236A1 (fr) 2014-04-09
EP2717236B1 EP2717236B1 (fr) 2018-03-14

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Family Applications (3)

Application Number Title Priority Date Filing Date
EP13198955.0A Active EP2717236B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de documents
EP10176018A Not-in-force EP2330568B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de documents
EP07841227.7A Active EP2066999B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de document

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP10176018A Not-in-force EP2330568B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de documents
EP07841227.7A Active EP2066999B1 (fr) 2006-08-22 2007-08-22 Agencement de détecteur optique pour accepteur de document

Country Status (5)

Country Link
US (1) US8836926B2 (fr)
EP (3) EP2717236B1 (fr)
JP (2) JP5178722B2 (fr)
ES (3) ES2390016T3 (fr)
WO (1) WO2008024863A2 (fr)

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US20040218114A1 (en) * 2001-11-13 2004-11-04 Lee Ik-Soo Light guiding plate, liquid crystal display device using the same, and method for displaying pictures thereof
EP1452908A1 (fr) * 2001-12-03 2004-09-01 Toppan Printing Co., Ltd. Feuille de mosaique de lentilles, ecran de transmission et afficheur de type retroprojecteur
WO2004013817A2 (fr) * 2002-07-29 2004-02-12 Giesecke & Devrient Gmbh Dispositif et procede de traitement de documents de valeur

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JP2010501861A (ja) 2010-01-21
WO2008024863A3 (fr) 2008-05-22
JP5178722B2 (ja) 2013-04-10
ES2390016T3 (es) 2012-11-05
US8836926B2 (en) 2014-09-16
JP2012181217A (ja) 2012-09-20
EP2330568A1 (fr) 2011-06-08
WO2008024863A2 (fr) 2008-02-28
EP2066999A4 (fr) 2011-06-08
EP2066999B1 (fr) 2019-10-23
JP5689445B2 (ja) 2015-03-25
ES2764959T3 (es) 2020-06-05
ES2665952T3 (es) 2018-04-30
EP2066999A2 (fr) 2009-06-10
EP2330568B1 (fr) 2012-06-20
US20100259749A1 (en) 2010-10-14
EP2717236B1 (fr) 2018-03-14

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